Why would anyone rebuild a cylinder without OEM seals? Saving $20 is not worth it in a part like that. IIRC I paid about $50 for each cylinder when I did 2 on my CTL, and that was at John Deere. The part that baffled me was shops were telling me $1000 each to rebuild, I said screw it and tore them apart, first one took me probably 4-5 hours as i've never touched one before, the second about 2 hours and haven't had a drifting problem since. I was pissed after the fact though, how could a shop justify charging $1900 in labour for maybe 2-3 hours work? The price was based off of only doing seals, any machining, etc would be more, I get you're paying for their experience but that's just gouging.